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Searching Array

Hello. I have a number array with fifty elements. I wish to search the array for the elements whose value is ,say, 5 . Then I will use the element's value and index number in a conditional. In short , how can I search the array for values and retrieve the index number ?

Thanks for the code @twodogs. Exactly this is the code I seek. But I have to retrieve every index that resides the element whose value is 5. In above code lets assume array[3] and array[4] values are 5. How can I retrieve both index from the loop?